389439643 has 2 divisors, whose sum is σ = 389439644. Its totient is φ = 389439642.

The previous prime is 389439613. The next prime is 389439649. The reversal of 389439643 is 346934983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 389439643 - 2¹³ = 389431451 is a prime.

It is not a weakly prime, because it can be changed into another prime (389439649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194719821 + 194719822.

It is an arithmetic number, because the mean of its divisors is an integer number (194719822).

Almost surely, 2^389439643 is an apocalyptic number.

389439643 is a deficient number, since it is larger than the sum of its proper divisors (1).

389439643 is an equidigital number, since it uses as much as digits as its factorization.

389439643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 49.

The square root of 389439643 is about 19734.2251684732. The cubic root of 389439643 is about 730.2642709913.

The spelling of 389439643 in words is "three hundred eighty-nine million, four hundred thirty-nine thousand, six hundred forty-three".